Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study
This study aims to evaluate the lifespan of Ti-Ag dry electrodes prepared using flexible polytetrafluoroethylene (PTFE) substrates. Following previous studies, the electrodes were designed to be integrated into wearables for remote electromyography (EMG) monitoring and electrical stimulation (FES) t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/19/8321 |
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| author | Daniel Carvalho Sandra Marques Giorgia Siqueira Armando Ferreira João Santos Dulce Geraldo Cidália R. Castro Ana V. Machado Filipe Vaz Cláudia Lopes |
| author_facet | Daniel Carvalho Sandra Marques Giorgia Siqueira Armando Ferreira João Santos Dulce Geraldo Cidália R. Castro Ana V. Machado Filipe Vaz Cláudia Lopes |
| author_sort | Daniel Carvalho |
| collection | DOAJ |
| description | This study aims to evaluate the lifespan of Ti-Ag dry electrodes prepared using flexible polytetrafluoroethylene (PTFE) substrates. Following previous studies, the electrodes were designed to be integrated into wearables for remote electromyography (EMG) monitoring and electrical stimulation (FES) therapy. Four types of Ti-Ag electrodes were prepared by DC magnetron sputtering, using a pure-Ti target doped with a growing number of Ag pellets. After extensive characterization of their chemical composition and (micro)structural evolution, the Ti-Ag electrodes were immersed in an artificial sweat solution (standard ISO-3160-2) at 37 °C with constant stirring. Results revealed that all the Ti-Ag electrodes maintained their integrity and functionality for 24 h. Although there was a notable increase in electrical resistivity beyond this timeframe, the acquisition and transmission of (bio)signals remained viable for electrodes with Ag/Ti ratios below 0.23. However, electrodes with higher Ag content (Ag/Ti = 0.31) became insulators after 7 days of immersion due to excessive Ag release into the sweat solution. This study concludes that higher Ag/Ti atomic ratios result in heightened corrosion processes on the electrode’s surface, consequently diminishing their lifespan despite the advantages of incorporating Ag into their composition. This research highlights the critical importance of evaluating electrode longevity, especially in remote biomedical applications like smart wearables, where electrode performance over time is crucial for reliable and sustained monitoring and stimulation. |
| first_indexed | 2024-03-10T21:34:58Z |
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| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T21:34:58Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj.art-c0950fe98548443c932c0f7bd7679a2d2023-11-19T15:05:54ZengMDPI AGSensors1424-82202023-10-012319832110.3390/s23198321Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive StudyDaniel Carvalho0Sandra Marques1Giorgia Siqueira2Armando Ferreira3João Santos4Dulce Geraldo5Cidália R. Castro6Ana V. Machado7Filipe Vaz8Cláudia Lopes9Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, PortugalPhysics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, PortugalPhysics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, PortugalPhysics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, PortugalChemistry Centre, University of Minho, 4710-057 Braga, PortugalChemistry Centre, University of Minho, 4710-057 Braga, PortugalInstitute for Polymers and Composites, University of Minho, 4800-058 Guimarães, PortugalPolymer Engineering Department, Institute for Polymers and Composites, University of Minho, 4800-058 Guimarães, PortugalPhysics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, PortugalPhysics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, PortugalThis study aims to evaluate the lifespan of Ti-Ag dry electrodes prepared using flexible polytetrafluoroethylene (PTFE) substrates. Following previous studies, the electrodes were designed to be integrated into wearables for remote electromyography (EMG) monitoring and electrical stimulation (FES) therapy. Four types of Ti-Ag electrodes were prepared by DC magnetron sputtering, using a pure-Ti target doped with a growing number of Ag pellets. After extensive characterization of their chemical composition and (micro)structural evolution, the Ti-Ag electrodes were immersed in an artificial sweat solution (standard ISO-3160-2) at 37 °C with constant stirring. Results revealed that all the Ti-Ag electrodes maintained their integrity and functionality for 24 h. Although there was a notable increase in electrical resistivity beyond this timeframe, the acquisition and transmission of (bio)signals remained viable for electrodes with Ag/Ti ratios below 0.23. However, electrodes with higher Ag content (Ag/Ti = 0.31) became insulators after 7 days of immersion due to excessive Ag release into the sweat solution. This study concludes that higher Ag/Ti atomic ratios result in heightened corrosion processes on the electrode’s surface, consequently diminishing their lifespan despite the advantages of incorporating Ag into their composition. This research highlights the critical importance of evaluating electrode longevity, especially in remote biomedical applications like smart wearables, where electrode performance over time is crucial for reliable and sustained monitoring and stimulation.https://www.mdpi.com/1424-8220/23/19/8321biopotentialdry electrodeslifespanTi-Ag thin filmsdegradationvoltammetry |
| spellingShingle | Daniel Carvalho Sandra Marques Giorgia Siqueira Armando Ferreira João Santos Dulce Geraldo Cidália R. Castro Ana V. Machado Filipe Vaz Cláudia Lopes Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study Sensors biopotential dry electrodes lifespan Ti-Ag thin films degradation voltammetry |
| title | Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study |
| title_full | Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study |
| title_fullStr | Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study |
| title_full_unstemmed | Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study |
| title_short | Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study |
| title_sort | enhancing the longevity and functionality of ti ag dry electrodes for remote biomedical applications a comprehensive study |
| topic | biopotential dry electrodes lifespan Ti-Ag thin films degradation voltammetry |
| url | https://www.mdpi.com/1424-8220/23/19/8321 |
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